D-3 is an uncompressed composite digital video format invented at NHK and introduced commercially by Panasonic.

Four channels of 48 kHz 16–20 bit PCM audio, and other ancillary data, are inserted during the vertical blanking interval.

The aggregate net (error corrected) bitrate of the format is 143 Mbit/s, and because the codec is lossless, it has been used in data applications.

The D-5 digital component video format, introduced in 1993 by Panasonic, uses the D-3 transport and tape running at roughly double D-3 speed.

There is doubt[1] over whether the surviving D-3 machines will last long enough to play the 340,000 tapes which the corporation holds.